 Let's say you're trying to find some solid information about a serious health problem that concerns you, high blood pressure, diabetes, yet everywhere you look someone's trying to sell you something like vitamins, yoga mats, blenders, drugs, well, breathe a sigh relief because all we bring you are the facts. Welcome to the Nutrition Facts Podcast. I'm your host, Dr. Michael Greger. When accompanied by a strength training regimen, 3 grams of creatine a day may improve muscle performance in older adults. Here's our first story. Creatine is a compound formed naturally in the human body that is primarily involved in energy production in our muscles and brain. It's also naturally formed in the bodies of many animals we eat, and so when we eat their muscles we can also take in some creatine through our diet. It was named after Crius, the Greek word for meat in which it was first isolated. We need about 2 grams a day, so those we meet may get like 1 gram from their diet and their body makes the rest from scratch. There are rare birth defects where you're born without the ability to make it in which case you have to get it all externally through diet, but otherwise our bodies can make as much as we need to maintain normal concentrations in our muscles. When people cut out meat, the amount of creatine floating around their bloodstream goes down, but the amount in your brain remains the same because your brain just makes all the creatine it needs. The level in vegetarian muscles is lower, but that doesn't seem to affect performance as both vegetarians and mediators respond to creatine supplementation with similar increases in muscle power output, and if vegetarian muscle creatine was insufficient then presumably they would have seen an even bigger boost. So basically when you eat meat that just means your body doesn't have to make as much. If creatine muscle content dropped as we grew older that might help explain age-related muscle loss, but that doesn't seem to be the case. Biopsies taken from the muscles of young and old adults show no difference in creatine content, but still if it improves performance maybe it would help. According to the International Society of Sports and Nutrition, creatine monohydrate is the single most effective ergogenic supplement available to athletes for increasing exercise capacity and lean body mass during training. It's no wonder survey show as many 70% plus college athletes have used creatine supplements. What can it do for older adults? Without exercise, nothing. Most studies on creatine supplementation alone show no benefits for muscle mass strength or performance. This makes sense given the mechanism. Creatine supplementation delays muscle fatigue. This enables people to work out longer and harder and it's that additional volume and intensity that leads to the muscle benefits. So creatine alone doesn't help and creatine taken in the context of the same training that's carefully controlled and deliberately equalized doesn't help either. But let people exercise as much as they can and most studies on creatine supplementation for the prevention and treatment of sarcopenia, meaning age-related muscle loss, show augmented lean mass as it does in young adults. Adding 3 to 5 grams of creatine a day to 2 to 3 days of resistance training a week added an additional 3 extra pounds of lean mass over an average duration of about 4 months. Now some of that lean mass may be water, weight, not muscle. Creatine causes water retention that can show up as lean mass, but compared to placebo, creatine combined with resistance exercise increases muscle strength as well. And the additional gains in mass and strength can persist as long as 12 weeks after stopping the creatine in older adults as long as the resistance training is maintained. So obviously it's not all just water weight. A reason I never advocated for creatine supplementation in older adults for muscle preservation was because systematic reviews up through 2017 concluded that adding creatine to training shows mixed results for muscle mass and strength and it did not appear to translate to improved functioning. However, an updated meta-analysis found a significant improvement over placebo in sit-to-stand test performance, which is a decent predictor of reduced falls risk. Again, this was mostly only when accompanied by strength training. There have still been no consistent benefits discovered for just supplementing with creatine alone. So creatine should always be prescribed with a progressive strength training regimen. The Society for Sarcopenia Cachexia Wasting Disease convened an expert panel that, despite the lack of long-term trials, suggested creatine be indeed used for the management of sarcopenia. The recommended dose to achieve muscle saturation is 3 grams a day. Within a month at that slow steady rate, you achieve the same muscle levels as loading with 120 grams over a period of a week. Note, though, it takes at least 12 weeks of creatine supplemented resistance training to see a significant additive effect. Recent evidence suggests taking it after exercise might be slightly preferable to before, but this has yet to be verified. Are there any side effects? We'll find out next. The Society for Sarcopenia Cachexia Wasting Disease convened an expert panel that, despite the lack of long-term trials, suggested creatine be used for the management of age-related muscle loss, also known as sarcopenia. Are there any creatine side effects? Well, if one can extrapolate from mice, one side effect may be longevity. The average healthy lifespan of creatine-fed mice was found to be 9% more than control mice, and they performed better on neurobehavioral tests, especially improved memory skills, but is taking creatine safe? One can take a bit of comfort in the fact that it's one of the world's best-selling dietary supplements with literally billions of servings taken, and the only consistently reported side effect has been weight gain, presumed to be from water retention. The only serious side effects appear to be among those with pre-existing kidney diseases taking whopping doses of like 20 grams a day for weeks. The bottom line, according to the European Food Safety Authority, is that doses of up to 3 grams a day are unlikely to pose any risk, provided high-purity creatine is used. Dietary supplements are not regulated by the FDA and may not actually contain what's on the label, or, in the case of creatine, be tainted with contaminants generated during the industrial production process. When researchers looked at 33 samples of creatine supplements made in the US and Europe, they all did actually contain creatine. That's good, but half exceeded the maximum level recommended by Food Safety Authorities for at least one contaminant. The researchers recommend that consumers choose products from producers that ensure the highest quality control, but that's easier said than done. One third-party supplement testing outfit that tested for purities chose bulk supplements brand, as their top pick, which also happened to be the cheapest at about 10 cents per daily 5 grams serving, which is a level teaspoon. What about just getting it from meat? You could get that 3 grams of creatine, eating about 5 steaks a day, since cooking destroys about 20%, but the heat reacts with the creatine and amino acids and meat to create carcinogenic heterocyclic amines, and one of the reasons meat is considered to be cancer-causing. A separate safety concern was raised that creatine and supplement form could potentially form a different carcinogen known as N-nitrososarcazine when it hit the acid bath of the stomach, but when actually put to the test, this does not appear to be a problem. Some have argued caution for creatine use among those with kidney issues. This concern appears to derive in part from a misinterpretation of laboratory data. The blood levels of a different compound called creatinine is used as a marker of kidney function. It's a muscle metabolism waste product that's regularly cleared out by well-functioning kidneys, so if your levels rise, maybe your kidneys aren't doing so good. But where does creatinine come from? The breakdown of creatine. So if you take extra creatine, your creatinine levels in your blood could rise, giving the false impression that your kidneys are malfunctioning, but instead you're just making more rather than clearing less. For patients who take creatine, doctors can consider other kidney function tests such as blood levels of a C-statin C levels, a waste product that's more independent of dietary intervention, so tell your healthcare professional if you start creatine. Overall, creatine supplementation appears to be safe for the kidneys, but the longest study to date is less than three years, so true long-term studies are lacking. Finally today, what are the potential consequences of having to make all your own creatine rather than relying on dietary sources? Almost universally, research findings show a poor vitamin B12 status among vegetarians, because they're not taking vitamin B12 supplements like they should. And this results in an elevation of homocysteine levels that may explain why vegetarians were recently found to have higher rates of stroke. Of course, plant-based eating is just one of many ways to get B12 deficient. I mean, even laughing gas can do it. In as short as two days, thanks to the recreational use of whipped cream canister gas, that's something new I learned today. Anyways, if you do eat plant-based, giving vegetarians and vegans even as little as 50 micrograms once a day of cyanocobalamin, the recommended most stable form of vitamin B12 supplement, and their homocysteine levels start up in the elevated zone, and within one to two months their homocysteines normalize right down into the safe zone under 10. Or just 2,000 micrograms of cyanocobalamin once a week, and you get the same beautiful result. But not always. In this study, even 500 micrograms a day either as a sublingual, chewable, or swallowing regular B12 supplement didn't normalize homocysteine within a month. Now, presumably if they had kept it up, their levels would have continued to fall like in the other study. But if your plant-based have been taking your B12 and your homocysteine levels are still too high, meaning above 10, is there anything else you can do? Now, inadequate folate intake can also increase homocysteine, but folate comes from the same root as foliage. It's found in leaves, concentrated in greens, as well as beans. But if you're eating beans and greens, taking your B12 and your homocysteine levels is still too high. Then I'd suggest trying as an experiment, taking one gram of creatine a day, and getting your homocysteine levels retested in a month to see if it helped. Creatine is a compound formed naturally in the human body that is primarily involved in energy production in our muscles and brain. It's also naturally formed in the bodies of many animals we eat, and so when we eat their muscles, we also can take in some creatine through our diet. We need about 2 grams a day, so those who eat meat may get like 1 gram from their diet, and their body makes the rest from scratch. There are rare birth defects where you're born without the ability to make it, in which case you have to get it from your diet, but otherwise our bodies make as much as we need to maintain normal concentrations in our muscles. When you cut out meat, the amount of creatine floating around your bloodstream goes down, but the amount in your brain remains the same. Showing dietary creatine doesn't influence the levels of brain creatine, because your brain just makes all the creatine you need. The level in vegetarian muscles is lower, but that doesn't seem to affect performance, as both vegetarians and meatians respond to creatine supplementation with similar increases in muscle power output. And if vegetarian muscle creatine was insufficient, then presumably they would have seen an even bigger boost. So basically, all that happens when you eat meat is that your body just doesn't have to make as much. What does this all have to do with homocysteine? Okay, in the process of making creatine, your body produces homocysteine as a waste product. Normally, this isn't a problem because your body has two ways to detoxify it, using vitamin B6, or using a combination of vitamins B12 and folate. Now B6 is found in both plant and animal foods. It's rare to be deficient, but B12 is mainly in animal foods, and so it can be too low in those eating plant-based who don't supplement or eat B12-fortified foods. And folate is concentrated in plant foods, so it can be low in those who don't regularly eat greens or beans or folic acid-fortified grains. Without that, escape valve homocysteine levels can get too high. If, however, you're eating a healthy plant-based diet and taking your B12 supplement, your homocysteine levels should be fine, but what if they're not? Right? One might predict that if you started taking creatine supplements, the level of homocysteine might go down since you're not going to have to be making so much of it from scratch, producing homocysteine as a by-product. We would love it if you could share with us your stories about reinventing your health through evidence-based nutrition. Go to nutritionfacts.org slash testimonials, which may be able to share it on social media to help inspire others. If you'd like to see any graphs, charts, graphics, images, or studies mentioned here, go to the Nutrition Facts Podcast landing page where you'll find all the detailed information you need, plus links to all the sources we cite for each of these topics. My last two books were How to Survive a Pandemic and My How Not to Diet Cookbook. Get ready this year for the launch of How Not to Age, and of course, all the proceeds for the sales of all my books goes directly to charity. 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